All wikis on wikispaces can be exported and downloaded. Starting an export is restricted to users with organizers status.

Last backups for download (inclusively last edits from 2th of Dec. 2015):

• HTML
• WikiText

HOW TO BACK UP

1. Go to http://xenharmonic.wikispaces.com/export/list
2. Set the content type to "Wikitext" and the file type to whatever you prefer
3. Hit export. Download it to your hard drive. Store it somewhere (archive.org?)
4. When you've finished, do another export, and this time set the content type to "HTML" and the file type to whatever you prefer again.

We previously had a list of times the xenwiki was backed up, but there's no point as it's on the above page anyway.